Electric burning-in knife



Oct. 26, 1948. F. D. PABIS V ELECTRIC BURNING-IN KNIFE Filed Nov. 15,1946 Z '8 Zn I22vent0r dag Attorneys FRANK 0- PA 5/5 Patented Oct. 26,1948 UNi'i'ED i A'l'ElN'l' QFFICE ELECTRIC BURNlNG-IN KNIFE Frank D.Pabis, Amsterdam, N. Y.

Application November 15, 1946, Serial No. 709,958

3 Claims. 1

The present invention relates to a novel and improved electricallyheated burning-in knife Which is expressly, but not necessarily, adaptedto effectively and adequately melt stick shellac, commonly known as woodcement, and to permit proper utilization of same in wood fillingoperations and the like.

Due to the nature of the conditions met in this line of endeavor andbecause of the character of so-called knives employed, excessive heat isdeveloped in the area in which the knife is employed and thus, as isobvious, makes the handling of the tool unhandy and interferes withexpedient usage of same. The purpose of the present invention is toprovide a tool of the type under advisement in which the parts are suchas to provide for adequate circulation of air in and around the toolpart, whereby to render same susceptible of adequate and easy handling.

More specifically, the invention has to do with the structural formationand styling of the coacting parts, whereby to provide an eiiicient toolwhich aptly fulfills the requirements of the results wanted, thestructure thus employed being possessed of requisite simplicity andreliability.

One phase of the invention has to do with the special head employed,this being provided with an appropriately shaped blade carried by ashank, said shank being formed with a shoulder portion and an axialreduced socket, the socket being adapted to accommodate an insertibleand removable electric heating element.

Another phase of the invention has to do with a suitably insulatedhollow handle mounted on and spaced from a tubular shank, the latterforming a part of a special adaptor unit and said unit including aperforated cylindrical shell to fit on and accommodate the speciallyformed shank portion of said head unit.

Other objects, features and advantages will become more readily apparentfrom the following description and the accompanying illustrativedrawings.

In the drawings, wherein like numerals are employed to designate likeparts throughout the views:

Figure 1 is a perspective view of a tool or socalled burning-in knifeconstructed in accordance with the principles of the present invention;

Figure 2 is a central longitudinal sectional view through the same;

Figures 3, 4 and 5 are cross sectional views, on enlarged scales, takenon the planes of the lines 3-3, 44 and 55 respectively; and,

,- insulation washer being shown at Figure 6 is a perspective View of awasher used in the completed assemblage.

Referring now to the drawings by distinguish ing reference numerals, itwill be observed, in an overall inspection of the drawings, that thecompleted tool is characterized essentially by a head unit A, a handleor hand-grip B, and an intervening coupling adaptor C associated withconnecting parts or units A and B.

The unit A comprises a head proper 8 with a suitably shaped blade 9connected thereto by way of the integral tang it. The head is provided,to the right in the drawing, with a shank including an annular mount l!and a stop shoulder l2, and an axially elongated reduced socket IS.

The unit C which is a combined adaptor and coupling, comprises acylinder it which telescopicelly receives the socket l3 and has one endfitted over the annular mount 3 i and against the stop shoulder l2,being held in place by a setscrew Hi. This cylinder is provided at itsrighthand end with an elongated tubular shank 16, said shank beingprovided with star-like spacers ii and fitting in the central bore i9and surrounding the shank, the parts co-acting in a manner to thusproperly mount and space the insulated hand-grip '26, as shown.Referring again to the coupling or cylinder it, it will be observed thatthis is provided with a plurality of air circulating perforations RI andwith a large air circulating hole 22 on one side. The current conductingcord is denoted at 23 and is provided with a conventional electricalheating element 24 fitting snugly in the socket [3, an

In Fi ures i and 5 I have shown the heating coil 26 in the shell of theheating element 24.

It is obvious, that the parts A, B and C are so designed and so co-actwith each other as to promote free air circulation and to thus kee thetool, as a unit, substantially cool, as compared to similar tools of thesame category, whereby to promote easy and practical handling. All ofthe parts are of the utmost simplicity, design, this in a manner tofacilitate assembling and disassembling, according to the requirementsof the occasion met.

A careful consideration of the foregoing description in conjunction withthe invention as illustrated in the drawings will enable the reader toobtain a clear understanding and impression of the alleged features ofmerit and novelty sufficient to clarify the construction of theinvention as hereinafter claimed.

Minor changes in shape, size, materials and rearrangement of parts maybe resorted to in actual practice so long as no departure is made fromthe invention as claimed.

The head I is also formed with a plurality of surface grooves 8a whichfunction to better aerate and cool down the adjacent parts.

I claim:

1. In a burning-in hand tool of the class described, an electricallyheated head unit including a body portion provided on one 1 side with anintegral axially positioned and elongated socket, and provided on anopposite side with a project: ing tang terminating in a laterally offsetflat blade, a heating element mounted in said elonr' gated socket, acoupling unit attached at one end to said head unit and partiallyenclosing and surrounding, in spaced relation, said "elongated socket,said portion of the coupling unit being p ovided with a multiplicity ofperforations for free circulation of cooling air, said coupling unitbeing further provided-with a reduced elongated tubular shank of adiameter matching that of the socket and in axial alignment with thesocket, said shankbeing adapted to accommodate a cord with which theelectric heating element is provided, and openwork' spacing spiders onsaid shankadapted to accommodate a centrally bored hand-grip. a

2. A burning-in hand tool of the class described comprising a one-pieceelectrically heated head unit including a fluted solid body portionhaving an angularly disposed projecting tang at one end terminating in afiat offset blade and provided at the opposite end with a reduced shankforming a shoulder and a reduced elongated axially projecting socketadapted to accommodate an electric heating element, and a coupling andhandle attaching unit embodying a cylindrical portion secured on saidshank and abutting said shoulder and concentrically surrounding saidsocket and. including a reduced tubular handle supporting shank.

3. The structure specified in claim 2 wherein a heating unit ismountedin said socket, said heating unit having a current supply cord, saidcord extending through said tubular shank, the tubular shank at itspoint of juncture with said cylindrical portion providing a shoulder,said shoulder assisting in holding the heating unit in the socket andalso providing a stop for one end of a hand-grip, and openwork spidersmounted on said-shank'and adapted to accommodate and support ahand-grip.

FRANK D. PABIS.

.REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

